摘要
井眼弯曲段的套管在承受常规载荷的同时还要承受弯矩载荷作用,因此导致弯曲段套管连接螺纹失效率较直井段要高,然而目前对套管连接螺纹在弯矩载荷作用下的力学行为认识尚不明确。针对该问题,该文基于虚功原理、接触非线性理论及Von Mises屈服准则,运用有限元分析软件建立并计算了弯矩载荷作用下套管连接螺纹的三维力学模型,获得了套管连接螺纹的应力分布规律,并用实验结果与数值模拟结果对比验证了模型的有效性;在此基础上对螺纹锥度、承载面角度、导向面角度、齿高及螺距五个螺纹参量进行了敏感性分析,最后总结了弯矩载荷作用下各螺纹参量对其应力分布的影响规律。该文的研究工作为套管偏梯形连接螺纹的优化设计提供了科学依据,对减少套管连接螺纹失效具有重要的工程价值。
The casing connecting thread bears both bending load and conventional load in the curved portion,which cause the casing connecting thread with higher failure rate in the curved portion than in the straight well.However,at present the mechanical behavior of casing connecting thread under bending load is indeterminate.Aiming at this issue,a 3-D mechanical model of the connecting thread is established and calculated by the finite-element analysis software based on the principle of virtual work,contact nonlinear theory and Von Mises elastic-plastic criteria,to obtain stress distribution of the casing connection thread.The comparison of numerical simulations and experimental results illustrates the validity of the model.On that basis,the parameter sensitivity of the taper,angle of bearing surface,angle of oriented surface,tooth depth and screw pitch are analyzed,and the influence of each parameters to the stress distribution under bending load is concluded.This paper provides the science basis to optimal designing,and it has important project significance on reducing the failure rate of casing connecting thread.
出处
《工程力学》
EI
CSCD
北大核心
2012年第10期301-307,共7页
Engineering Mechanics
基金
国家自然科学基金项目"高温腐蚀环境下套管的结构完整性评价方法研究"(51004082)
"气体钻井钻具与井壁的碰摩机理及量化评价方法研究"项目(50804040)
关键词
偏梯形连接螺纹
弯矩载荷
参量敏感性
有限元分析
应力分布
buttress thread
bending load
parameter sensitivity analysis
FEM analysis
stress distribution
